65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
//Utility function to perform hexdumps in the default format of the bsd hexdump utility
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//(C) 2017 Jeroen Domburg <jeroen at spritesmods dot com>
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//This file is public domain where possible or CC0-licensed where not.
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//CC0: https://creativecommons.org/share-your-work/public-domain/cc0/
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#include <stdio.h>
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#include <ctype.h>
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#include <stdint.h>
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void hexdumpFrom(void *mem, int len, int adrStart) {
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uint8_t *data=(uint8_t*)mem;
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int pos=0;
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while (pos<len) {
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//Print address
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printf("%08x", pos+adrStart);
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//Print hex bytes
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for (int i=0; i<16; i++) {
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if ((i&7)==0) printf(" ");
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if (pos+i<len) {
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printf(" %02x", data[pos+i]);
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} else {
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printf(" ");
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}
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}
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//Print ASCII bytes
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printf(" |");
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for (int i=0; i<16; i++) {
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//Abort if at end
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if (pos+i>=len) break;
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//Print if printable
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if (isprint((int)data[pos+i])) {
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printf("%c", data[pos+i]);
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} else {
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printf(".");
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}
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}
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printf("|\n");
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pos+=16;
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}
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printf("%08x\n", adrStart+len);
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}
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void hexdump(void *mem, int len) {
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hexdumpFrom(mem, len, 0);
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}
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//Uncomment the following line and compile 'gcc -o hexdump hexdump.c' to create a barebones hexdump utility that
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//reads stdin and dumps the hex content of it to stdout
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//#define TESTCASE
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#ifdef TESTCASE
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#include <stdlib.h>
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int main(int argc, char **argv) {
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char buff[1024];
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int adr=0;
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if (argc>1) adr=strtol(argv[1], NULL, 0);
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int i=0;
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int ch;
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while ((ch=getchar())!=EOF) buff[i++]=ch;
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hexdumpFrom(buff, i, adr);
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}
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#endif
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